The point here is simple and radical: As the Catholic writer G.K. Chesterton argued, men and women are either created in "the image of God" or they are "a disease of the dust." If human beings are merely the sum of their physical attributes -- the meat and bones of materiality -- they are easier to treat as objects of exploitation.
So Catholicism offers a second contribution: It is the main defender of human dignity against a utilitarian view of human worth. And the church has applied this high view of man with remarkable consistency -- to the unborn and the elderly, the immigrant and the disabled. Individual views on issues of life and death vary widely, even within the Catholic Church. But it is a good thing to have at least one global institution firmly dedicated to the proposition that every growing child, every person living in squalor or in prison, every man or woman approaching death or contemplating suicide or trapped in profound mental disability, every apparently worthless life is not really worthless at all.
An institution accused of superstition is now the world's most steadfast defender of rationality and human rights. It has not always lived up to its own standards, but where would those standards come from without it?